Before we hear any more about Avengers 4, though, we've got Infinity War to get through – which has recently been revealed as a 'heist film'.

Director Anthony Russo recently explained that a lot of Infinity War has a "heist-style" energy to it.

"We've shaped an interesting narrative around [Thanos] that in some ways leans heavily on a heist film in the fact that he's going after the Infinity Stones in a much bolder, successful way than he has in the past," he said.

"The entire movie has that energy of the bad guy being one step ahead of the heroes."

Avengers: Infinity War will be released in the UK on April 27, 2018, and in the US on May 4, 2018.Avengers 4 will be released in the UK on April 26, 2019, and in the US on May 3, 2019.